Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '86750ccbf5377b7d0fc002896310ec60757e2de6b28d1e2782116f5ce7481e5f' 
  AND token = 'xbEkXCLKycw2y9LgTJMKnc4VrdcNbMJYF9zqLvwL/WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}